在Jupyter Notebook或终端中,df.head和df.head()都可以返回数据帧的输出,但有一些细微差别.两个不同表达式之间的根本区别是什么,以及括号在Python中一般扮演什么角色？谢谢!
>>>df.head
<bound method NDFrame.head of Date Open High Low Close Volume
0 1-Jun-17 153.17 153.33 152.22 153.18 16404088
1 2-Jun-17 153.58 155.45 152.89 155.45 27770715
2 5-Jun-17 154.34 154.45 153.46 153.93 25331662
3 6-Jun-17 153.90 155.81 153.78 154.45 26624926
4 7-Jun-17 155.02 155.98 154.48 155.37 21069647
5 8-Jun-17 155.25 155.54 154.40 154.99 21250798
6 9-Jun-17 155.19 155.19 146.02 148.98 64882657
7 12-Jun-17 145.74 146.09 142.51 145.42 72307330
8 13-Jun-17 147.16 147.45 145.15 146.59 34165445
9 14-Jun-17 147.50 147.50 …